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Experimental Design. 8 th Grade Science Objective: Design a controlled scientific experiment S1, C2, PO2. What careers or professions use the Scientific Method?. scientists city water/ sewer/ landfills/etc. medical professions research and development of products ??.

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experimental design

Experimental Design

8th Grade Science

Objective: Design a controlled scientific experiment

S1, C2, PO2

what careers or professions use the scientific method
What careers or professions use the Scientific Method?
  • scientists
  • city water/ sewer/ landfills/etc.
  • medical professions
  • research and development of products
  • ??
the good news there might be a cure but the treatment is still experimental
The Good News? There might be a cure but the treatment is still experimental.
  • You have to participate in a clinical study to determine the effectiveness of the treatment.
problem
Problem
  • Does Blahcure relieve the symptoms of Blah-Blah disease?
hypothesis
Hypothesis
  • The more Blahcure given/taken, the less evident the symptoms will be.
dependent variable
Dependent Variable
  • Measure the symptoms of the disease
  • Check to see if patient feels better
constants
Constants
  • Same disease & level of sickness
  • Age of participant
  • Same health conditions of diet, exercise, vitamins, etc.
  • Habits such as smoking or drinking
  • Same exam
control group
Control Group
  • It represents what is Normal.
  • Doesn’t get any treatment.
  • Give them aplacebo (fake pill).
experimental group
Experimental Group
  • Different amounts of the medication
2 problem
2. Problem
  • Does the amount of fertilizer given to a plant affect how tall the plant will grow?
hypothesis1
Hypothesis
  • The more fertilizer used, the taller the plant will grow.
dependent variable1
Dependent Variable
  • Height of the plant
constant variables
Constant Variables
  • Sunlight
  • Climate
  • Water
  • Soil (sandy, peat moss, etc)
control group1
Control Group
  • It represents what is Normal.
  • So what is “normal?”.
  • Plain dirt…NORMAL SOIL.
experimental group1
Experimental Group
  • Different amounts of fertilizer.
3 problem
3. Problem
  • Does the type of tennis shoe effect the number of shin splints and knee problems for runners?
hypothesis2
Hypothesis
  • The __________ (kind of shoe) will reduce the number of shin splints/knee problems the runner will have.
independent variable2
Independent Variable
  • Kinds of

shoes

dependent variable2
Dependent Variable
  • Number of shin splints and knee problems runners have.
constant variables1
Constant Variables
  • Same runner
  • Distance run per day
  • Length of time tested (1 month)
  • Size of shoe
control group2
Control Group
  • Nike Shox

(Any type you think of as “normal”)

experimental group2
Experimental Group
  • Nike Air
  • Asics Gel
  • Addidas Running Shoe